From 59b83c14fd2bec0b8c8afa7a2fa0357af7f0f827 Mon Sep 17 00:00:00 2001
From: Jitse Niesen <jitse@maths.leeds.ac.uk>
Date: Sat, 10 Sep 2011 09:18:18 +0100
Subject: Write page on template and typename keywords in C++. After yet
 another question on the forum, I decided to write something on this common
 issue. Now we just need to link to this and get people to read it. Thanks to
 mattb on the forum for some links. Caveat: IANALL (I am not a language
 lawyer).

---
 doc/examples/TemplateKeyword_flexible.cpp | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 doc/examples/TemplateKeyword_flexible.cpp

(limited to 'doc/examples/TemplateKeyword_flexible.cpp')

diff --git a/doc/examples/TemplateKeyword_flexible.cpp b/doc/examples/TemplateKeyword_flexible.cpp
new file mode 100644
index 000000000..9d85292dd
--- /dev/null
+++ b/doc/examples/TemplateKeyword_flexible.cpp
@@ -0,0 +1,22 @@
+#include <Eigen/Dense>
+#include <iostream>
+
+using namespace Eigen;
+
+template <typename Derived1, typename Derived2>
+void copyUpperTriangularPart(MatrixBase<Derived1>& dst, const MatrixBase<Derived2>& src)
+{
+  /* Note the 'template' keywords in the following line! */
+  dst.template triangularView<Upper>() = src.template triangularView<Upper>();
+}
+
+int main()
+{
+  MatrixXi m1 = MatrixXi::Ones(5,5);
+  MatrixXi m2 = MatrixXi::Random(4,4);
+  std::cout << "m2 before copy:" << std::endl;
+  std::cout << m2 << std::endl << std::endl;
+  copyUpperTriangularPart(m2, m1.topLeftCorner(4,4));
+  std::cout << "m2 after copy:" << std::endl;
+  std::cout << m2 << std::endl << std::endl;
+}
-- 
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